face, and if you're trying to conceal it, it may well leak out in a microexpression. >> reporter: 3,000 behavior detection officers have been trained in dr. ekman's methods. >> he's starting to really sweat now. >> reporter: at a cost of $200 million a year. even though critics say there's no scientific evidence of its reliability for use in counterterrorism. >> the simple answer is, no, there is no scientific support for this system as of now. >> reporter: in fact, a report last year by the general accountability office found that at least 17 people later arrested for terrorism, including the times square bomber, faisal shahzad, went through airports with the trained screeners and were never detected. >> the united states is spending incredible amounts of money on tsa personnel and a s.p.o.t. program that's supposed to detect bad behavior, and i don't think we're capable of detecting what took place in moscow. >> reporter: the tsa continues